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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec30686f59e91c0cb8cf4a4129cc158c072121ed0aee389569189f0f6ebdf13c' 
  AND token = 'PIWpY2kHT5M5AEzI9yS3/3KHqoRO9MdE3a1J1eAJpfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}